Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.h"
 
 #include <time.h>
 
@@ skipping 148 matching lines @@
   }
   return TRUE;
 }
 
 FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict) {
   m_pEncryptDict = pEncryptDict;
   m_Version = pEncryptDict->GetIntegerBy("V");
   m_Revision = pEncryptDict->GetIntegerBy("R");
   m_Permissions = pEncryptDict->GetIntegerBy("P", -1);
   if (m_Version < 4) {
-    return _LoadCryptInfo(pEncryptDict, CFX_ByteString(), m_Cipher, m_KeyLen);
+    return _LoadCryptInfo(pEncryptDict, CFX_ByteStringC(), m_Cipher, m_KeyLen);
   }
   CFX_ByteString stmf_name = pEncryptDict->GetStringBy("StmF");
   CFX_ByteString strf_name = pEncryptDict->GetStringBy("StrF");
   if (stmf_name != strf_name) {
     return FALSE;
   }
-  if (!_LoadCryptInfo(pEncryptDict, strf_name, m_Cipher, m_KeyLen)) {
+  if (!_LoadCryptInfo(pEncryptDict, strf_name.AsByteStringC(), m_Cipher,
+                      m_KeyLen)) {
     return FALSE;
   }
   return TRUE;
 }
 
 FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict,
                                                uint32_t type,
                                                int& cipher,
                                                int& key_len) {
   m_pEncryptDict = pEncryptDict;
   m_Version = pEncryptDict->GetIntegerBy("V");
   m_Revision = pEncryptDict->GetIntegerBy("R");
   m_Permissions = pEncryptDict->GetIntegerBy("P", -1);
   CFX_ByteString strf_name, stmf_name;
   if (m_Version >= 4) {
     stmf_name = pEncryptDict->GetStringBy("StmF");
     strf_name = pEncryptDict->GetStringBy("StrF");
     if (stmf_name != strf_name) {
       return FALSE;
     }
   }
-  if (!_LoadCryptInfo(pEncryptDict, strf_name, cipher, key_len)) {
+  if (!_LoadCryptInfo(pEncryptDict, strf_name.AsByteStringC(), cipher,
+                      key_len)) {
     return FALSE;
   }
   m_Cipher = cipher;
   m_KeyLen = key_len;
   return TRUE;
 }
 
 FX_BOOL CPDF_StandardSecurityHandler::GetCryptInfo(int& cipher,
                                                    const uint8_t*& buffer,
                                                    int& keylen) {
@@ skipping 496 matching lines @@
   buf[11] = 'b';
   uint8_t* aes = FX_Alloc(uint8_t, 2048);
   CRYPT_AESSetKey(aes, 16, key, 32, TRUE);
   uint8_t iv[16], buf1[16];
   FXSYS_memset(iv, 0, 16);
   CRYPT_AESSetIV(aes, iv);
   CRYPT_AESEncrypt(aes, buf1, buf, 16);
   FX_Free(aes);
   pEncryptDict->SetAtString("Perms", CFX_ByteString(buf1, 16));
 }